[pmodisns20 Problem]

Hi,

I am working with Digilent Discovery 2 and PMODISNS20 board for current measure. The system work but sometime (every about 20 time) the VB code read a bad value of current. I send you my VB source code. Can you help me to found the problem or you send me an example code ?

        dwf.FDwfDeviceOpen(-1, hdwf)

        Threading.Thread.Sleep(20)

        dwf.FDwfAnalogIOChannelNodeSet(hdwf, 0, 0, 1.0)
        dwf.FDwfAnalogIOChannelNodeSet(hdwf, 0, 1, 3.3)
        dwf.FDwfAnalogIOEnableSet(hdwf, 1)

        Threading.Thread.Sleep(170)

        dwf.FDwfDigitalSpiSelect(hdwf, 0, 1) ' CS DIO-0 high

        dwf.FDwfDigitalSpiFrequencySet(hdwf, 20000.0)

        dwf.FDwfDigitalSpiClockSet(hdwf, 2)

        'dwf.FDwfDigitalSpiDataSet(hdwf, 0, 1) ' 0 DQ0_MOSI_SISO = DIO-1
        dwf.FDwfDigitalSpiDataSet(hdwf, 0, 1)

        dwf.FDwfDigitalSpiModeSet(hdwf, 1)

        dwf.FDwfDigitalSpiOrderSet(hdwf, 1) ' 1 MSB first

        Dim bbRx(2) As Byte
        Dim bbRx1 As UInteger

        Dim corrente As Double = 0
        Dim average As Double = 0
        Dim somma As Double = 0

        ' spurius reads
        For c = 0 To 5
            dwf.FDwfDigitalSpiSelect(hdwf, 0, 0) ' CS DIO-0 low
            dwf.FDwfDigitalSpiRead(hdwf, 0, 8, bbRx, 2)
            dwf.FDwfDigitalSpiSelect(hdwf, 0, 1) ' CS DIO-0 high
            Threading.Thread.Sleep(3)
        Next

        Threading.Thread.Sleep(30)

        For c = 0 To 20

            dwf.FDwfDigitalSpiSelect(hdwf, 0, 0) ' CS DIO-0 low
            dwf.FDwfDigitalSpiRead(hdwf, 0, 8, bbRx, 2)
            dwf.FDwfDigitalSpiSelect(hdwf, 0, 1) ' CS DIO-0 high

            bbRx1 = (bbRx(0) * 256 + bbRx(1)) / 2
            corrente = (11.117 * (bbRx1 - 2048))

            somma = somma + corrente

        Next

        average = somma / 20

        dwf.FDwfDeviceCloseAll()

        WriteRichTextBox1(vbCrLf)
        WriteRichTextBox1("Current detector average ")
        WriteRichTextBox1(average)
        WriteRichTextBox1(" mAmp ")
        WriteRichTextBox1(vbCrLf)

 

 

[script file manager]

Hi,

if I want save some data with script, I use these instructions:

var f =  File("data.txt");

f.write("data to save: " + d1);

the file data.txt is save in the waveform installation folder.

I need to set this folder, I need that this folder is the folder where I save ".dwf3work" files. How can I do this ?

By Sergio.

[voltmeter script complete example]

Yes, but there is a bug ? The possibility of script selection not work ?

For my application is better to have a single configuration with different scripts.

Sergio.

[voltmeter script complete example]

Hi Attila,

very good. Now it'work.

I have an other question : If I have 1 script, from windows command line I can run script by command : "WaveForm.exe myconf.dwf3work -runscript" . How I read in help documentation,  If I have 2 script ,  I use this commands : "WaveForm.exe myconf.dwf3work -script scriptname1" and "WaveForm.exe myconf.dwf3work -script scriptname2" but the script that run is the last script saved in the last configuration and not "scriptname1" or "scriptname2". Can you help me ?

Sergio.

[voltmeter script complete example]

Hi, I have test better,

the script work only if I am running "Voltmeter" otherwise read the last value read and it not update the value.

How can I update the read value by script ?

Sergio

[voltmeter script complete example]

big Attila,

thank you, the problem is solved.

[voltmeter script complete example]

Hi , have you a complete example Voltmeter script ?

I have window Voltmeter that works well in run mode and it read 3.4 Volt.

I need a script that read the voltage value. I run this

 

if(!('Voltmeter' in this)) throw "Please open a Voltmeter";

var vPtt = 0;
var media = 0;

for(var i = 0; i < 10; i++){
    vPtt1 = Voltmeter.Input.Channel1.DC.value;
    media = media + vPtt;
    wait(0.1);
    print("vPtt: "+vPtt+" V");

}
media = media / 10;
var f = File("data.txt");
f.write(media+" voltPtt");

 

the value vPtt is always 0 , why ?

Have you an example ?